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Leaf Mine.  Any insect which lays its eggs in the spongy layer between the upper and lower surfaces of leaves is known as a leaf miner.  They are typically moths, sawflies (a type of wasp), flies, or sometimes beetles.  This white leaf mine is made by Liriomyza eupatoriella, a species of fly.  Larvae develop between the leaf surfaces and tunnel or ‘mine’ out the spongy middle layer as they grow (ArborCARE® Tree Service Ltd).  The line becomes wider as the leaf miner grows.  They only attack the top cell of a leaf, and if flipped over, you cannot see any damage on the leaf. 

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Photographs by Valerie Lykes